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Finding the Fourth Proportional to 1,280.54, 1,920.60 and 458.66

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Solution

The fourth proportional to 1,280.54, 1,920.60 and 458.66 is: 687.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.54 : 1,920.60 = 458.66 : x
  2. Step 2: Convert to fraction form
    1,280.54/1,920.60 = 458.66/x
  3. Step 3: Cross multiply
    1,280.54x = 1,920.60 × 458.66
  4. Step 4: Simplify right side
    1,280.54x = 880,902.40
  5. Step 5: Solve for x
    x = 880,902.40/1,280.54
  6. Step 6: Final answer
    x = 687.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.